28-01-2013, 11:22 AM
A technical paper presentation On POWER GENERATION FROM WHEELS OF RUNNING TRAINS
1 POWER GENERATION.doc (Size: 967 KB / Downloads: 355)
ABSTRACT:
Now a day’s power crisis is the major problem. Sources are minimizing but requirements are increasing. In traction major amount of power is going to utilize not only for running but also for coach uses. My paper explains how we can minimize the power consumption for coach uses through by self generating of power in an advanced way compared to old alternator method using V-BELTS i.e.,(power generation through axles)
The power supply technology used in train interiors have indirect coupling with axle. This makes system lesser efficient and bulky. The paper deals with improvement in the performance of power supply system. Magnets mounted on axles with stator of slotted hollow cylinder will make alternator that will be robust and light weight. This cheaper system will be simple and easy to use. The problem of alternator pulley and axle pulley damage can be solved. The output voltage from alternator will have a many frequencies .Hence we will pass it through converter cum regulator insuring total elimination of harmonics . The pure DC output from it will be feed to batteries and supply
OBJECTIVE OF THE WORK:
To make power supply system for trains with betterment in scales of efficiency, cost, safety, weight, simplicity and reliability.
INTRODUCTION:
In the present scenario the biggest problem is of energy crisis, the roundabout cause for climate change. The energy can be conserved by enhancing the productivity of systems .Since now day's locomotive engines are replaced by electric trains because of better performance of engines. Hence the main focus of engineers is to reduce the electricity requirement and make trains more efficient. For that they experimented mainly on size and weight but results upgraded only little performance.
The concept of automatic feedback electric systems is very innovative in this field it's never used in past. It is a feedback system because rotational energy is output of train while it is input for alternator and output of alternator, electricity is again transferred to power supply system of train. .The production of electricity from this system is also at the time of breaking. Since trains have very fluctuating speed hence this electricity produced will also be fluctuating in nature so we cannot feed this to supply directly.
METHODOLOGY:
Rotating axles of the trains can be the source of rotational(mechanical) energy for a alternator, this is the key idea of the project. Generally trains have 400-1500 rpm in normal speed. If we cover the axle by hollow cylinder with conductor slots and rotor mounted with permanent magnets then this will make a alternator [1]. A thin layer of insulation is provided to axle from rotor for high quality safety purpose. Holders confirm the connectivity of magnets and axle. Stator keeps interaction with magnetic field with the aid of hollow cylinder. This is shown in the Fig 1. The battery is connected to the alternator through rectifier-cum-regulated unit, which converts AC output of alternator into regulated DC and prevents the reverse flow of current from the battery to the alternator during periods of non-generation. This is shown in Fig. 2. The design with regulator cum rectifier has magnetic amplifier type control on field excitation. Subject to the condition that total current of alternator is less than rated current output the regulator shall regulate the output voltage of the alternator so as to maintain a pre-set voltage subject to the tolerance at the rectifier terminals under the following conditions.
CONCLUSION:-
The weight of currently used alternator is almost 500 kg while the predicated weight of this single system is less than 15-50 kg. Now there is no need to design a rotor and its stabilizing accessorizes, the axle will work for rotor. The output of regulator is provided to supply and charging unit while at the time of zero movement of the train battery is used for supply. The cut-in speed and MFO speed of the alternator shall be as low as possible consistent with economical design. By means of this design the performance of train can be drastically enhanced with attention on safety. Hence we will be able to not only reduce mechanical complexities but also cost and weight of power supply system will be also drastically drop. With all this trains can come with super efficiency power supply system